Resorting to mechanical enemies, robots and stuff was weak. I can't believe they couldn't come up with human enemies, with Spidey's rogue gallery being so vast!
Nearly every boss battle has Spidey facing a mindless enemy or a feral beast.
Props to them for including some villain cameos (Mr. Negative's one comes to mind) but still that came off more like a tease to me and it felt frustrating. Gimme human villains to beat up!

For the sake of the story some of this was understandable, the robots part
Why keep the cross-species mindless, even monster Lizard when he was talking in the movie is a pretty bad move